Consolidated Statements of Condition (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Statement of Financial Position [Abstract]
Securities held to maturity, fair value	$ 88,351	$ 50,980	$ 29,011
Allowance for loan losses	$ 17,239	$ 16,825	$ 15,322
Preferred Stock, Par value	$ 2.5	$ 2.5	$ 2.5
Preferred Stock, Shares authorized	20,000,000	20,000,000	20,000,000
Preferred Stock, Shares outstanding	0	0	0
Common Stock, Par value	$ 2.5	$ 2.5	$ 2.5
Common Stock, Shares authorized	20,000,000	20,000,000	20,000,000
Common Stock, Shares issued	6,043,616	6,027,968	6,018,135
Common Stock, Shares outstanding	5,981,016	5,965,368	5,955,535
Treasury Stock, Shares	62,600	62,600	62,600